Dry and wet heater for combined use

ABSTRACT

A dry and wet heater for combined use, characterized in that said heater comprises a steam passage disposed inside a steam heating medium chamber and communicating with a steam supply source; and a pipe of a small diameter disposed inside said steam heating medium chamber and connecting a yarn introducing tube to said steam passage.

United States Patent 1191 1 1 3,720,079 Katsumata et al. 1 1March 13,1973 I DRY AND WET HEATER FOR {58] Field of Search ..57/34 HS; 28/62;68/6, 5 D, COMBINED use 622/1310. 1 [75] Inventors: Takuma Katsumata,Inazawa; Hisao Takahashi, Higashi-ku, Nagoya; [561 References and ShinjiKato, Makagawa-ku, Nagoya, all of Japan Assignee: Mitsubishi JukogyoKabushiki Kaisha, Tokyo, Japan Filed: May 11, 1971 Appl. N0.: 142,264

Foreign Application Priority Data May 25, 1970 Japan .I Q..4'5/5'129'7 I11.8. c1. ..68/6, 28/62, 57/34 HS, 68/DIG. 1

1m. (11.....' ..D06c 1/00 FOREIGN PATENTS OR APPLICATIONS 303,993 3/1955Switzerland ..68/6

Primary Examiner-William I. Price Attorney-Wendemth, Lind & Ponack [57]ABSTRACT A dry and wet heater for combined use, characterized in thatsaid heater comprises a steam passage disposed inside a steam heatingmedium chamber and communicating with a steam supply source; and a pipeof a small diameter disposed inside said steam heating medium chamberand connecting a yarn introducing tube to said steam passage.

2 Claims, 5 Drawing Figures PATENTEUHIIRI3I9T5 3,720,079

SHEET 10F 2 (PRIOR ART) STEAM "(3.4

i F f (PRIOR ART) INVENTORS fl (3.3 TAKUMA KATSUMATA H\S/-\O TAKAHASHISI-HNJI KATO ATTORNEYS PATENTFDHAmma 0,079

SHEET 2 OF 2 INVENTORS TAKU MA KATSUMATA I-HSAO TAKAH ASHi SHIN J1 KATOATTORNEYS DRY AND WET HEATER FOR COMBINED USE The present inventionrelates to a dry and wet type heater for combined use and moreparticularly to a heater applicable with false twisting machines andyarn twisting machines.

Heretofore, the conventional type heaters jointly using dry and wetheats have been of a type in which, as shown in FIG. 1 and FIG. 2,saturated steam is introduced into the upper portion of a dry heat typeheater or into a yarn introducing tube. More specifically, as shown inFIG. 1, saturated steam 4 is introduced into a point above a dry heattype heater 3 provided with an electric heater 2 which is controlled bya controller 1. In FIG. 2, saturated steam 4 is fed into the yarnintroducing tube 8 through which a yarn 7 passes, said tube 8 beingsurrounded with a heating medium of steam 6 that has been producedthrough evaporating heating medium by means of an electric heater 2.Insulating material is shown at 9.

Heaters of this type as shown in FIGS. 1 and 2 have the disadvantagesthat part of the steam 4 is condensed and adheres to the inner wall ofthe yarn introducing tube 8, thus preventing easy drainage of the waterproduced, and that the evaporation latent heat thereof tends toadversely affect the temperature of heat which is maintained constantinside the yarn introducing tube 8. To overcome this problem, there hasbeen proposed a method in which the saturated steam is first introducedinto a heating device 10 before entering the yarn introducing tube andthen the resultant superheated steam is fed into the yarn introducingtube, as shown in FIG. 3. However, the problem has still remainedunsolved, because it was found to be extremely difficult to obtainsuperheated steam having little temperature variation throughout pluralbobbins. Furthermore, added difficulties arise in insulating the heatfor said heating device (10). The steam being fed from said heatingdevice to each yarn introducing tube is cooled before arriving at saidtubes due to the insufficient flow rate of the steam and, thus fails toachieve the intended purposes. To overcome this cooling problem, itwould be possible to locate the steam heating device immediatelybeforethe yarn introducing tubes for each bobbin. However, this presentsother difficulties leading to a complicated construction of such device,thus bringing about higher production cost in practical applications.

Furthermore, a method, such as shown in FIG. 4, has been proposed in anattempt to obtain superheated .steam by locating a steam chamber 11around the outer periphery of heater 6 which is filled with a heatingmedium of steam. This method, however, has been found to be defective inpractical applications because construction of such a device becomes toocomplicated when the same degree of temperature accuracy as in said yarnintroducing tubes 8 is sought to be obtained.

The object of the present invention is to overcome the aforementioneddisadvantages inherent to the conventional heaters.

According to the present invention, there is provided a heater utilizingin combination dry and wet heats, wherein a steam passage is providedinside the steam heat medium chamber which communicates with the yarnintroducing tube by way of a small diameter pipe, whereby superheatedsteam may be fed into said tube so that each yarn introducing tube canbe fed the superheated steam having uniform temperature variationthroughout the yarn introducing tubes irrespective of the bobbins.

These and other objects, features and advantages of the presentinvention will be apparent in the course of the following description,which is based upon the accompanying drawings, in which:

FIG. 1, FIG. 2 and FIG. 4 are longitudinal cross sectional viewsillustrative of the outline of the conventional type heater utilizingdry and wet heats in combination;

FIG. 3'is a plan view of another type of conventional heater utilizingdry and wet heats in combination; and

FIG. 5 is a longitudinal cross sectional view of one embodiment of thepresent invention showing a heater utilizing dry and wet heats incombination.

Referring now to FIG. 5, a closed-type steam heating medium chamber isshown at 12 and contains a heating medium therein. A yarn introducingtube 13 extends through and in the center of said chamber 12.Surrounding the lower portion of said tube 13 is heating medium 14 whichis contained in said chamber 12 in a sealed manner, and an electricheater 15 is inserted into said heating medium 14.

While only one steam heating medium chamber 12 of a sealed type isprovided around each tube, many of such chambers may be provided inparallel relationship so as to communicate with each other by way of anupper connecting pipe 17 and a lower connecting pipe 16. indicated at 18is a steam passage which extends through said upper connecting pipe 17and communicates with another saturated steam supply source (not shown).Communicating with said steam passage 18 is a pipe of a small diameter19 which extends through said steam chamber 12 and has an end open insaid yarn introducing tube 13, thereby providing means to feed the steamthrough the steam passage 18 into said yarn introducing tube. Shown at20 is a pipe connecting the upper connecting pipe 17 to the lowerconnecting pipe 16, said pipe 20 being adapted to return heating mediumcondensed in the upper connecting pipe 17 to the lower connecting pipe16 and extending through the insulating materials 22 encompassed withthe outer casing 21. There is adanger, however, that instability mayoccur in the temperature of the heating 7 medium 14, because of aninsufficient volume of saturated steam being fed into the steam passage18. Therefore, said steam passage should preferably be disposed in avapor phase portion of the chamber 12. In this way it would not have asadverse an effect on the temperature of the heating medium as it wouldbe if it were disposed in the heating medium 14. In passing, shown at 23is a yarn being heated.

In the operation of the embodiment of the present invention thusconstructed, when electric current flows through the electric heater 15,the heating medium 14 will be heated and evaporated. The evaporatedsteam thus produced will fill the steam heating medium chamber 12, andin turn the condensation latent heat of the steam will heat the yarnintroducing tube. The radient heat of the tube then heats the yarn 23passing therethrough, thereby thermally setting the yarn.

To maintain the yarn introducing tube 13 at a predetermined temperature,there is provided a steam heating medium heater of a known typeincorporating a controller (not shown) which is adapted to sense andrespond to the pressure of the steam heating medium inside the closedsteam heating medium chamber. Alternatively the temperature in the yarnintroducing tube 13 can be used.

With the steam passage 18 together with the yarn introducing tube 13being located in the same steam heating medium chamber, the temperatureof the former may be controlled by means of steam heating medium to atemperature of the yarn introducing tube 13. When the saturated steamproduced at the other saturated steam supply source (not shown) is fedinto said passage 18 at a constant pressure, it will turn intosuperheated steam which, in turn, is delivered to the yarn introducingtube 13 via pipe 19 without being subjected to temperature changes,thereby causing the superheated steam to fill the yarn introducing tube13 with the temperature of said superheated steam maintained equal tothat of the yarn introducing tube.

As will be apparent from the foregoing description, the presentinvention provides a heater which comprises a steam passage disposedinside the steam heating medium chamber and communicating with a steamsupply source; and a small diameter pipe which is connected to the yarnintroducing tube, whereby the steam inside said steam passage may beturned into superheated steam, the temperature of which is accuratelycontrolled by a device of a known type. Furthermore, the temperatures ofthe steam passage and the pipe can be controlled and maintained to thatin the yarn introducing tube, thereby permitting superheated steam of atemperature equal to that in the yarn introducing tube to be fed intothe latter through the small diameter pipe,'with the result that theyarn being treated can be subjected to stable wetness and heat effects,thus resulting in a high quality product.

The communication between the steam passage and the yarn introducingtube permits simultaneous delivery of the superheated steam to aplurality of yarn introducing tubes at a constant pressure and flowrate, as long as the pressure of the steam being fed into steam passage18 is maintained at a constant value. As

' can be seen from the foregoing description, despite the simpleconstruction, the present invention provides a heater utilizing dry andwet heats in combination, which can supply superheated steam to aplurality of yarn introducing tubes simultaneously at a constanttemperature, pressure and flow rate, thereby producing high quality yarnand which is economical and compact in construction.

The heating device of the present invention is particularly applicableto high speed false twisting machines and yarn twisting machines.

What is claimed is:

l. A heater utilizing both dry and wet heat for heating yarncomprisingza steam heating chamber adapted to contain heated steamtherein; a yarn introducing tube passing substantially through thecenter of said chamber; a steam passage lying within said chamber andbeing adapted to communicate with a steam supply source; a pipeconnected between said steam passage at a point remote from said supplysource and said yarn introducing tube, said pipe having a smallerdiameter than the diameter of said steam passage, said ipe als o havinga substantial length and lying complete y within said steam chamber,whereby steam passing through said pipe is subjected to the heat of thesteam within said chamber.

1. A heater utilizing both dry and wet heat for heating yarncomprising:a steam heating chamber adapted to contain heated steamtherein; a yarn introducing tube passing substantially through thecenter of said chamber; a steam passage lying within said chamber andbeing adapted to communicate with a steam supply source; a pipeconnected between said steam passage at a point remote from said supplysource and said yarn introducing tube, said pipe having a smallerdiameter than the diameter of said steam passage, said pipe also havinga substantial length and lying completely within said steam chamber,whereby steam passing through said pipe is subjected to the heat of thesteam within said chamber.
 1. A heater utilizing both dry and wet heatfor heating yarn comprising:a steam heating chamber adapted to containheated steam therein; a yarn introducing tube passing substantiallythrough the center of said chamber; a steam passage lying within saidchamber and being adapted to communicate with a steam supply source; apipe connected between said steam passage at a point remote from saidsupply source and said yarn introducing tube, said pipe having a smallerdiameter than the diameter of said steam passage, said pipe also havinga substantial length and lying completely within said steam chamber,whereby steam passing through said pipe is subjected to the heat of thesteam within said chamber.